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Help Identify Random Frame

Old 03-23-13, 05:16 AM
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taner rona
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Help Identify Random Frame

Hi all, i found this bike but i cant idendified it.Frame has fast back seat stays.It has half-lug on head tube.There isnt any lug on seat stay tube.It is 2.500 gr,heavier than my cilo frame which is 2.000 gr.There isnt any pantograph on the frame and there is I0A107955 number under BB.Cables go inside the frame.Black areas are just painted with spray color.There isnt any lug or something else.BB Shell
Width is 68mm and threading is 35mm.
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Old 03-23-13, 06:04 AM
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The serrial number and frame characteristics suggest 1990. By that era, most brands were contracting manufacture to companies in Taiwan nad China. I can't identify the serial number format with a particluar company. Are the dropouts branded?
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Old 03-23-13, 06:45 AM
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Drop-outs are not branded and usually there is a hole on drop-outs for setting axle back or forward but this drop-out has not a hole.
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Old 03-24-13, 05:18 AM
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seatpost is 25.8mm,any idea ?
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Old 03-26-13, 04:09 PM
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No, but the seat post size corresponds to a hi-tensile steel tubeset. I'm surprizeded it is that light. but that is probably because it is lugless.
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Old 03-26-13, 04:23 PM
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Originally Posted by taner rona View Post
Drop-outs are not branded and usually there is a hole on drop-outs for setting axle back or forward but this drop-out has not a hole.
On a lowerend frame they would not bother to drill and tap the dropouts for the adjuster. This dropout is designed to put the wheel in a certain spot for an index system.

How did you measure the seatpost? calipers or a tape measure?

OH wait! isn't a 35mm Swiss? I bet it is a Peugeot from when they were internally welded.

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Old 03-26-13, 06:24 PM
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I have its own 25.4 mm seatpost and it just fine.I also measured it with tape measure.What about tubes ? U said its hi-tensile (hi-ten) so is it that bad ?
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Old 03-26-13, 06:29 PM
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By the way.There is also 6064 written under BB.
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Old 03-27-13, 06:02 AM
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Originally Posted by taner rona View Post
I have its own 25.4 mm seatpost and it just fine.I also measured it with tape measure.What about tubes ? U said its hi-tensile (hi-ten) so is it that bad ?
Hi-tensile is a very common family of steels used in entry level bicycles frames. It's perfectly adequate for the job, but it's lower strength means it has to be made thicker to handle the loads and therefore results in a heavier frame. The most common higher grade steels used on bicycle frames are chromium-molybdenum (CrMo) and manganese molybdenum (MnMo). They're higher stregth allows for thinner tubes and therfore lighter frames.

Most seat tubes have an outside diamter of 28.6mm. Given a 25.8mm post, that means your frame would have a seat tube with about 1.4mm thick tubing. By comparison, most CrMo or MnMo seat tubes are no thicker than 0.9mm. That's a substantial reduction in material (and weight) when there's no signifigant difference in the density of steels, regardless of the alloy.

The other advantage is that thinner tubes also provide a more resilient, less fatiguing ride, due to the lower section modulus. In other words, thinner tubes have more spring and shock absorption ability.

Of course, the disadvantage of the higher strength steel alloys is that they cost more. Consequently, manufacturers resort to hi-tensile steels for entry level models where riders are more concerned with price than they are about weight and ride characteristics.
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Old 03-28-13, 02:49 PM
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Thanks for informations.
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